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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
IJCMAS is now DOI (CrossRef) registered Research Journal. The DOIs are assigned to all published IJCMAS Articles.
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National Academy of Agricultural Sciences (NAAS)
NAAS Score: *5.38 (2020)
[Effective from January 1, 2020]
For more details click here

ICV 2018: 95.39
Index Copernicus ICI Journals Master List 2018 - IJCMAS--ICV 2018: 95.39
For more details click here

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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
Publisher : Excellent Publishers
Email : editorijcmas@gmail.com / submit@ijcmas.com
Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2018: 95.39
NAAS RATING 2020: 5.38

Int.J.Curr.Microbiol.App.Sci.2017.6(8): 2407-2421
DOI: https://doi.org/10.20546/ijcmas.2017.608.285


Exploration of Genetic Diversity for Qualitative Traits among the Extant Upland Cotton (Gossypium hirsutum L.) Varieties and Parental Lines
Rathinavel*
Central Institute for Cotton Research, Regional Station, Coimbatore-641003, T.N., India
*Corresponding author
Abstract:

A study was conducted to characterize and evaluate the extant varieties and parental lines of upland cotton using qualitative morphological traits for DUS testing of cotton. These data were subjected to various genetic principles. The results indicated that out of 26 traits, only 17 traits were included for Principal Component analysis (PCA) because of expression of variability. Traits like stem hairiness, flower petal colour and density of seed fuzz expressed much variation (four states) compared to other traits. Nine traits viz., hypocotyl pigmentation, leaf gossypol glands, leaf nectaries, leaf petiole pigmentation, stem pigmentation, male sterility, boll bearing habit, boll prominence of tip and boll opening showed no variability. The PCA revealed that the first seven PCs having eigen values >1 and contributed for 76.67% of the total variation. The variance explained by PC1 was mostly due to traits related to colour such as boll colour, petal colour, petal spot, anther filament colour, pollen colour, boll surface and leaf shape, whereas PC II mostly related to stem hairiness, leaf hairiness, leaf shape and bract type. Two-dimensional scatter plot was drawn supported with grouping patterns of cluster analysis. The cluster analysis classified 101 extant varieties into five divergent groups. The cluster II comprising of largest (57) genotypes followed by cluster I (36). The Shannon–Weaver diversity index (H’) was used for estimating the frequency distribution of diversity index. The traits viz., hypocotyl pigmentation, leaf gossypol glands, leaf nectarines, leaf petiole pigmentation, stem pigmentation, flower male sterility, boll bearing habit, boll prominence of tip and boll opening were higher (4.62) when compared to other traits.


Keywords: Qualitative traits, Principal component analysis, Dendrogram, Eigenvalue.
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How to cite this article:

Rathinavel, K. 2017. Exploration of Genetic Diversity for Qualitative Traits among the Extant Upland Cotton (Gossypium hirsutum L.) Varieties and Parental Lines.Int.J.Curr.Microbiol.App.Sci. 6(8): 2407-2421. doi: https://doi.org/10.20546/ijcmas.2017.608.285